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Math Help - Probability help (this is driving me nuts)

  1. #1
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    Probability help (this is driving me nuts)

    I have been at this for 3 days already and i did some of them but i just am so confused that my brain hurts even trying to figure out if i am doing the right stuff. please please help me/ show me or point me in the right direction with these problems

    5. There is a 50-50 chance that Barbara carries the gene for hemophilia. If she is a carrier,
    then each of her children has a 50-50 chance of having hemophilia. Suppose that Barbara has had three
    children, and none of them have the disease. What is the probability that Barbara is a carrier? If she has a
    fourth child, what is the probability that the child will have hemophilia?


    6. In a class there are 4 freshman boys, 6 freshman girls, and 6 sophomore boys. How many
    sophomore girls must be present if sex and class are to be independent when a student is selected at random?
    Last edited by mr fantastic; September 17th 2009 at 05:44 AM. Reason: Questions moved from another thread.
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